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An insulated pistoncylinder device contains 0.8 L of
Chapter 8, Problem 833(choose chapter or problem)
An insulated pistoncylinder device contains 0.8 L of saturated liquid water at a constant pressure of 120 kPa. An electric resistance heater inside the cylinder is turned on, and electrical work is done on the water in the amount of 1400 kJ. Assuming the surroundings to be at 258C and 100 kPa, determine (a) the minimum work with which this process could be accomplished and (b) the exergy destroyed during this process.
Questions & Answers
QUESTION:
An insulated pistoncylinder device contains 0.8 L of saturated liquid water at a constant pressure of 120 kPa. An electric resistance heater inside the cylinder is turned on, and electrical work is done on the water in the amount of 1400 kJ. Assuming the surroundings to be at 258C and 100 kPa, determine (a) the minimum work with which this process could be accomplished and (b) the exergy destroyed during this process.
ANSWER:Step 1 of 9
An insulated cylinder is initially filled with saturated liquid water at a specified pressure. The water is heated electrically at constant pressure. The minimum work by which this process can be accomplished and the exergy destroyed are to be determined.
Assumptions are
1. The kinetic and potential energy changes are negligible.
2. The cylinder is well-insulated and thus heat transfer is negligible.
3. The thermal energy stored in the cylinder itself is negligible.
4. The compression or expansion process is quasi-equilibrium.